The low-profile Klipsch KPT-884 highoutput cinema subwoofer uses an advanced low-frequency 4-inch voice coil driver design mounted in a bass reflex enclosure to shake things up and deliver deep, driving bass. Less than 23 inches in depth, this system utilizes a single 18-inch driver that gains its high efficiency through the use of large, geometrically optimized structures and a lightweight cone. Built from the inside out for performance and durability, the KPT-884 packs a punch that lets audiences hear as well as feel the impact of edge-of-your-seat entertainment. In fact, it is capable of delivering an earth-shaking low frequency of 18Hz.